... : 1.rough,fine and finish grinding stone surface 2.machine: manual,multi-heads,automatic machine 3.high efficiency advantage:1 ... rough,fine and finish grinding stone surface2.for machine: manual,multi-heads,automatic machine3.strong grinding ability,low cost ... 3000# are resin bonded for fine and finish grinding.manual machineautomatic mahcinemulti-head machine diamond grinding plate with metal body ...